protected function getFilterCompass()
{
$assetPath = $this->assetPath();
$cachePath = $this->cachePath();
$compass = new CompassFilter('/usr/local/bin/compass');
$compass->setHttpPath('/assets/');
$compass->setImagesDir($assetPath . '/img');
$compass->setHttpGeneratedImagesPath('img');
$compass->setGeneratedImagesPath($cachePath . '/img');
$compass->setJavascriptsDir($assetPath . '/js');
$compass->setHttpJavascriptsPath('assets/js');
$compass->setNoCache(true);
$compass->setScss(true);
return $compass;
}